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Test D: No Communication With Instrument Cluster Module

  1. Turn ignition switch to LOCK position. Disconnect 20-pin instrument cluster harness connector C251. It may be necessary to remove instrument cluster for access to connector. See ANALOG INSTRUMENT PANELS - MUSTANG article. Measure voltage between ground and instrument cluster harness connector C251 terminal No. 10 (Red/White wire). See Fig 1 . If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Red/White wire between instrument cluster and fuse No. 21 (5-amp) in Central Junction Box (CJB). CJB is located behind left side of instrument panel. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
  2. Turn ignition switch to RUN position. Measure voltage between ground and instrument cluster harness connector C251 terminal No. 11 (Pink/Black wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Pink/Black wire between instrument cluster and fuse No. 5 (15-amp) in Central Junction Box (CJB). CJB is located behind left side of instrument panel. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
  3. Measure voltage between ground and instrument cluster harness connector C251 terminal No. 12 (White/Light Blue wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open in White/Light Blue wire between instrument cluster and fuse No. 34 (20-amp) in Central Junction Box (CJB). CJB is located behind left side of instrument panel. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
  4. Turn ignition switch to LOCK position. Measure resistance between ground and instrument cluster harness connector C251 terminal No. 20 (Black/White wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Black/White wire between instrument cluster and ground. Ground point is located behind center of instrument panel. See GROUND DISTRIBUTION article in WIRING DIAGRAMS.
  5. Measure resistance between ground and instrument cluster harness connector C251 terminal No. 1 (Black wire). If resistance is 5 ohms or less, repair module communication concern. See MODULE COMMUNICATIONS NETWORK - MUSTANG article. If resistance is more than 5 ohms, repair open in Black wire between instrument cluster and ground. Ground point is located behind center of instrument panel. See GROUND DISTRIBUTION article in WIRING DIAGRAMS.
Fig 1: Identifying Instrument Cluster Harness Connector C251 Terminals
G99E02708Courtesy of FORD MOTOR CO.
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